我试图查询我的数据,但我没有将其附加到FirebaseRecyclerAdapter
。
我已经在logcat中打印了输出,它成功了,下面是我的代码。
mDatabase = FirebaseDatabase.getInstance().getReference("Blog").child("Events");
Query queryRef = mDatabase.orderByChild("EventType").equalTo("Graduation Party");
queryRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
System.out.println("My Values :"+ dataSnapshot);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
但我想将这些结果附加到FirebaseRecyclerAdapter
。以下是我的代码。
@Override
protected void onStart() {
super.onStart();
// mAuth.addAuthStateListener(mAuthLitsener);
FirebaseRecyclerAdapter<Event,EventViewHolder> firebaseRecyclerAdapter_ = new FirebaseRecyclerAdapter<Event, GraduationListActivity.EventViewHolder>(Event.class,
R.layout.item_event_view,
GraduationListActivity.EventViewHolder.class,
mDatabase) {
@Override
protected void populateViewHolder(GraduationListActivity.EventViewHolder viewHolder, final Event model, final int position) {
final String key_post = getRef(position).getKey();
viewHolder.setEventLocation(model.getEventlocation());
viewHolder.setEventName(model.getEventName());
viewHolder.setEventType(model.getEventType());
viewHolder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Toast.makeText(EventViewActivity.this,"This is : "+position,Toast.LENGTH_LONG).show();
Intent loadMainActivity = new Intent(GraduationListActivity.this,MainActivity.class);
loadMainActivity.putExtra(EventViewHolder.KEY_PARTY_NAME, model.getEventName());
startActivity(loadMainActivity);
}
});
}
};
mRecyclerview_event_view.setAdapter(firebaseRecyclerAdapter_);
}
答案 0 :(得分:0)
您首先声明的内容
Query queryRef;
和说;
mDatabase = FirebaseDatabase.getInstance().getReference("Blog").child("Events");
queryRef = mDatabase.orderByChild("EventType").equalTo("Graduation Party");
然后在您的onStart
放置query
后mDatabase
这样做
@Override
protected void onStart() {
super.onStart();
// mAuth.addAuthStateListener(mAuthLitsener);
FirebaseRecyclerAdapter<Event,EventViewHolder> firebaseRecyclerAdapter_ = new FirebaseRecyclerAdapter<Event, GraduationListActivity.EventViewHolder>(Event.class,
R.layout.item_event_view,
GraduationListActivity.EventViewHolder.class,
queryRef) {
@Override
protected void populateViewHolder(GraduationListActivity.EventViewHolder viewHolder, final Event model, final int position) {
final String key_post = getRef(position).getKey();
viewHolder.setEventLocation(model.getEventlocation());
viewHolder.setEventName(model.getEventName());
viewHolder.setEventType(model.getEventType());
viewHolder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Toast.makeText(EventViewActivity.this,"This is : "+position,Toast.LENGTH_LONG).show();
Intent loadMainActivity = new Intent(GraduationListActivity.this,MainActivity.class);
loadMainActivity.putExtra(EventViewHolder.KEY_PARTY_NAME, model.getEventName());
startActivity(loadMainActivity);
}
});
}
};
mRecyclerview_event_view.setAdapter(firebaseRecyclerAdapter_);
}
希望这很好用